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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fe724397efe584cd7505cb5f0b9fd5797863fa05f85f54c2a6e8ec303f4696' 
  AND token = 'aOr01rTyJ2z2KZONBIqTMqjlI8U4wwdCMqMTPddLQZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}